US20100280503A1 - Laser system that is gentle on the eyes, for refractive surgery - Google Patents
Laser system that is gentle on the eyes, for refractive surgery Download PDFInfo
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- US20100280503A1 US20100280503A1 US12/532,058 US53205808A US2010280503A1 US 20100280503 A1 US20100280503 A1 US 20100280503A1 US 53205808 A US53205808 A US 53205808A US 2010280503 A1 US2010280503 A1 US 2010280503A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F9/00802—Methods or devices for eye surgery using laser for photoablation
- A61F9/00804—Refractive treatments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F9/00825—Methods or devices for eye surgery using laser for photodisruption
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F2009/00861—Methods or devices for eye surgery using laser adapted for treatment at a particular location
- A61F2009/00872—Cornea
Definitions
- the invention relates to a laser system that is gentle on the eye, for refractive surgery, and to a refractive treatment method that is gentle on the eye.
- “refractive surgery” by means of lasers is understood to be the interaction of laser radiation with parts of the eye, in order to alter the refractive properties of the eye, and consequently its imaging properties, for the purpose of eliminating, or at least alleviating, imaging defects.
- a particularly important example of refractive surgery is the correction of the defective vision of an eye by means of the LASIK technique.
- the cornea is first cut open laterally by means of, for example, a microkeratome, and the thus resulting small cover (also termed flap) is folded to the side.
- laser radiation is used to effect a so-termed ablation, i.e. the removal of tissue in accordance with a calculated ablation profile.
- the small cover is subsequently folded back, and a relatively painless and rapid healing process ensues. Following this procedure, the cornea has different imaging properties, and the defective vision has been remedied or reduced.
- the lateral incision into the cornea is effected by means of a so-termed microkeratome, i.e. an oscillating mechanical cutting edge.
- a so-termed microkeratome i.e. an oscillating mechanical cutting edge.
- so-termed femtosecond microkeratomes in which femtosecond laser pulses are focussed in the tissue of the cornea, in order to produce therein, by means of closely adjacent focal points of the radiation, a so-termed laser-induced perforation, or so-termed laser-induced photo-disruptions in the corneal tissue, which are performed in the corneal tissue in such a way that a cut is ultimately produced, as in the case of a mechanical microkeratome.
- laser radiation of differing wavelengths and/or pulse durations is used in laser-optical eye surgery.
- cuts incision
- NIR near-infrared
- a pulse duration in the femtosecond range is also referred to as a femtosecond microkeratome.
- photoablation of stroma tissue laser radiation in the ultraviolet wavelength range, for example 193 nm, is generally used, wherein the pulse duration used can also be longer, as far as into the nanosecond range.
- a visible wavelength is used in the case of cutting of the flap by means of a femtosecond laser, for example a titanium-sapphire laser having a wavelength of 710 nm to 810 nm, or a frequency-doubled infrared system having a wavelength of approximately 517 nm, there occurs during the operation process a visual stressing of the patient that is unacceptable.
- a femtosecond laser for example a titanium-sapphire laser having a wavelength of 710 nm to 810 nm, or a frequency-doubled infrared system having a wavelength of approximately 517 nm
- UV femtosecond laser systems having a frequency tripling of infrared radiation emit a wavelength of approximately 345 nm in that, for example, the third harmonic is produced.
- this wavelength an extremely efficient conversion of the laser-beam energy is produced during the photo-disruption process. Nevertheless, approximately 5% of the energy enters further into the eye and is absorbed in the lens. Further, there is produced a blue-light fluorescence with a fluorescence maximum at 440.
- WO 89/06519 A2 discloses the use of a wavelength in the range from 1400 to 1800 nm in the case of intrastromal keratomileusis for the purpose of modifying the curvature of the cornea.
- U.S. Pat. No. 6,258,082 B1 discloses a diode laser having a wavelength of 980 nm, 1.5 ⁇ m and 1.9 ⁇ m, as well as a diode-pumped Er:YAG laser having a wavelength of approximately 2.94 ⁇ m.
- the radiation emitted by this laser is applied in the case of photorefractive keratectomy, phototherapeutic keratectomy, intrastromal photokeratectomy, LASIK and LASE.
- U.S. Pat. No. 5,656,186 is concerned with ablation and a laser-induced perforation of the cornea by means of laser pulses of the range from 150 fsec to 7 nsec. A wavelength of 770 nm is used for this purpose.
- the object is achieved by an eye treatment device according to Claim 1 .
- the light emitted by the radiation source has such a wavelength range that it brings about a reaction in a treatment region of an eye and is absorbed, at least partially, in at least one of the regions located behind same in the direction of the retina. This has the advantage that the light radiation passing through the treatment region is absorbed, and damage to the structures located behind the treatment region can be prevented.
- the light emitted by the radiation source can have a wavelength range in which the treatment region is partially transmissive.
- the treatment region can be the cornea.
- the light radiation passing through the cornea can be absorbed, for example, in the aqueous humour. Consequently, damage to structures located behind the aqueous humour, for example the iris, the lens, the vitreous body and the retina, can be prevented.
- the reaction brought about in the treatment region by the light can be an ablation of tissue.
- the ablation of tissue enables the cornea to be reshaped, in order to correct any defective vision.
- the reaction brought about in the treatment region by the light can also be a laser-induced optical perforation of tissue, which is also referred to as photo-disruption.
- the laser-induced perforations, or the photo-disruptions can be used to produce a cut in the cornea.
- the radiation source can be a laser source.
- a femtosecond laser source can be used to produce the laser-induced perforations.
- the wavelength range of the light emitted by the radiation source is approximately 1600 nm to approximately 1700 nm, preferably approximately 1625 nm to approximately 1675 nm, most preferably approximately 1640 nm to approximately 1660 nm.
- the cornea is transmissive of light and the light passing through the cornea is absorbed in the aqueous humour, as a result of which damage to the structures located behind the aqueous humour, for example the iris, the lens, the vitreous body or the retina, can be prevented.
- the systems Co:MgF 2 and Cr:YAG are possibilities as femtosecond laser systems for the wavelength range 1600-1700 nm.
- a method for treating the eye with light has such a wavelength range that it brings about a reaction in a treatment region and is absorbed, at least partially, in at least one of the regions located behind same in the direction of the retina. This has the advantage that the light radiation emerging from the treatment region is absorbed, and damage to the structures located behind the treatment region can be prevented.
- the treatment region can be substantially transmissive in the wavelength range.
- the treatment region can be the cornea.
- the light radiation passing through the cornea can be absorbed, for example, in the aqueous humour. Consequently, damage to structures located behind the aqueous humour, for example the iris, the lens, the vitreous body and the retina, can be prevented.
- the reaction brought about in the treatment region by the light can be an ablation of tissue.
- the reaction brought about in the treatment region by the light can also be a laser-induced optical perforation of tissue.
- the radiation source can be a laser source.
- the wavelength range in the case of the method is approximately 1600 nm to approximately 1700 nm, preferably approximately 1625 nm to approximately 1675 nm, most preferably approximately 1640 nm to approximately 1660 nm.
- the cornea is transmissive of light and the light passing through the cornea is absorbed in the aqueous humour, as a result of which damage to the structures located behind the aqueous humour, for example the iris, the lens, the vitreous body and the retina, can be prevented.
- FIG. 1 shows an eye model according to Gullstrand-Le Grand
- FIG. 2 is a diagram representing the transmission of the cornea
- FIG. 3 is a diagram representing the transmission of the aqueous humour.
- Radiation sources suitable for ablation and incision are known to the specialist in the field of ophthalmology, in particular refractive surgery. These radiation sources include laser light sources. As mentioned at the beginning, pulse durations in the femtosecond range are used for incision, and longer pulse durations are used for ablation. So-termed frequency multipliers can be used to adapt the wavelength of the laser to the application. Such laser systems are known to the specialist in the art, and need not be described in greater detail.
- FIG. 1 shows an eye model by Gullstrand-Le Grand.
- the cornea 1 has a front surface 2 and a rear surface 3 .
- Located behind the rear surface 3 of the cornea 1 is the aqueous humour 4 .
- Located behind the aqueous humour 4 is the lens 5 , having a front surface 6 and a rear surface 7 .
- Adjoining behind the lens is the vitreous body 8 .
- the retina 9 Located behind the vitreous body 8 is the retina 9 . The light goes into the eye through the cornea 1 and is imaged onto the retina 9 .
- a laser-induced optical perforation is used to produce a cut in the cornea 1 , by means of a femtosecond laser. It is understood that the laser radiation is not fully absorbed through the laser-induced perforation in the cornea 1 .
- the portion of the laser radiation not absorbed in the cornea 1 passes through the aqueous humour 4 , the lens 5 and the vitreous body 8 , and strikes the retina 9 .
- the patient may have side-effects, for example the previously mentioned transient light syndrome or damage to the retina 9 resulting from the blue-light hazard effect.
- the portion of the radiation not absorbed in the cornea 1 can pass through the aqueous humour 4 , the lens 5 and the vitreous body 8 , and strike the retina 9 .
- the previously described side-effects occur, depending on the wavelength used.
- the radiation of the excimer laser having a wavelength of 193 nm, is absorbed fully in the cornea.
- FIG. 2 is a diagram representing the degree of transmission of the cornea.
- FIG. 3 is a diagram representing the degree of transmission of the aqueous humour.
- the unbroken line shows the total transmission of the cornea 1 , which transmission was ascertained from six eyes.
- the curve denoted by 1 in FIG. 1 shows the direct transmission in the case of an eye of a child of 41 ⁇ 2 years of age, and the curve denoted by 2 shows the direct transmission in the case of an eye of a person of 53 year of age.
- the cornea is the aforementioned treatment region.
- a treatment is to be possible, not only on the surface of the cornea 1 , but also in deeper regions of the cornea 1 . Consequently, the wavelength range selected for the treatment is to be selected in such a way that the cornea 1 is partially transmissive in this wavelength range.
- Suitable for this purpose, according to FIG. 2 are, on the one hand, the wavelength range from 300 nm to 1300 nm and the wavelength range from 1600 nm to 1700 nm.
- the previously described side-effects can be prevented if the radiation not absorbed in the treatment region, i.e. the cornea, is absorbed in a region located behind same. In this case, the radiation not absorbed in the cornea cannot reach, for example, the lens and/or the retina 9 .
- a wavelength range lies from approximately 1600 nm to. If the radiation not absorbed in the cornea 1 to use in the aqueous humour approximately 1700 nm, since in this range the aqueous humour 4 has a comparatively low transmission. Consequently, the absorption of the radiation not absorbed in the cornea 1 occurs in a region that absorbs as close as possible to the cornea 1 4 , it cannot pass through the iris, the lens 5 and the vitreous body 8 and strike the retina 9 , or it can do so only having been weakened by the absorption in the aqueous humour 4 . As a result, damage to or impairment of other regions of the eye, and the previously described side-effects, are prevented to a large extent.
Abstract
Description
- This application is a United States national phase application of co-pending international patent application number PCT/EP2008/002233, filed Mar. 19, 2008, which claims the benefit of European patent application number EP 07005598.3, filed Mar. 19, 2007, the disclosure of which is incorporated herein by reference.
- The invention relates to a laser system that is gentle on the eye, for refractive surgery, and to a refractive treatment method that is gentle on the eye.
- In ophthalmology, “refractive surgery” by means of lasers is understood to be the interaction of laser radiation with parts of the eye, in order to alter the refractive properties of the eye, and consequently its imaging properties, for the purpose of eliminating, or at least alleviating, imaging defects.
- A particularly important example of refractive surgery is the correction of the defective vision of an eye by means of the LASIK technique. In the case of LASIK according to the prior art, the cornea is first cut open laterally by means of, for example, a microkeratome, and the thus resulting small cover (also termed flap) is folded to the side. In the thus exposed stroma of the cornea, laser radiation is used to effect a so-termed ablation, i.e. the removal of tissue in accordance with a calculated ablation profile. The small cover is subsequently folded back, and a relatively painless and rapid healing process ensues. Following this procedure, the cornea has different imaging properties, and the defective vision has been remedied or reduced.
- Usually, in the case of the prior art, the lateral incision into the cornea, described above, is effected by means of a so-termed microkeratome, i.e. an oscillating mechanical cutting edge. More recently, use has also been made of so-termed femtosecond microkeratomes, in which femtosecond laser pulses are focussed in the tissue of the cornea, in order to produce therein, by means of closely adjacent focal points of the radiation, a so-termed laser-induced perforation, or so-termed laser-induced photo-disruptions in the corneal tissue, which are performed in the corneal tissue in such a way that a cut is ultimately produced, as in the case of a mechanical microkeratome.
- Depending on the nature of the treatment (e.g. incision or ablation) and/or the tissue type, laser radiation of differing wavelengths and/or pulse durations is used in laser-optical eye surgery. For the application of cuts (incision) in the cornea (for instance, for the preparation of a flap), it is usual to use laser radiation in the range from approximately 340 to 350 nm or in the near-infrared (NIR) wavelength range, for example between 1000 and 1100 nm, with a pulse duration in the femtosecond range. Such a system is also referred to as a femtosecond microkeratome. By contrast, for photoablation of stroma tissue, laser radiation in the ultraviolet wavelength range, for example 193 nm, is generally used, wherein the pulse duration used can also be longer, as far as into the nanosecond range.
- In general, in the case of cutting of the flap by means of the femtosecond laser, there occurs an energy transmission of approximately 40% through the cornea. This energy transmitted through the cornea can result, in the eye, in a strong radiation impact that is manifested in the patient as a side-effect, for example as the so-termed transient light syndrome (TLS), over several months.
- If a visible wavelength is used in the case of cutting of the flap by means of a femtosecond laser, for example a titanium-sapphire laser having a wavelength of 710 nm to 810 nm, or a frequency-doubled infrared system having a wavelength of approximately 517 nm, there occurs during the operation process a visual stressing of the patient that is unacceptable.
- UV femtosecond laser systems having a frequency tripling of infrared radiation emit a wavelength of approximately 345 nm in that, for example, the third harmonic is produced. In the case of this wavelength, an extremely efficient conversion of the laser-beam energy is produced during the photo-disruption process. Nevertheless, approximately 5% of the energy enters further into the eye and is absorbed in the lens. Further, there is produced a blue-light fluorescence with a fluorescence maximum at 440.
- nm, which corresponds to the peak of the so-termed blue-light hazard effect (blue-light hazard) and results, most importantly, in damage to the retina.
- WO 89/06519 A2 discloses the use of a wavelength in the range from 1400 to 1800 nm in the case of intrastromal keratomileusis for the purpose of modifying the curvature of the cornea.
- U.S. Pat. No. 6,258,082 B1 discloses a diode laser having a wavelength of 980 nm, 1.5 μm and 1.9 μm, as well as a diode-pumped Er:YAG laser having a wavelength of approximately 2.94 μm. The radiation emitted by this laser is applied in the case of photorefractive keratectomy, phototherapeutic keratectomy, intrastromal photokeratectomy, LASIK and LASE.
- U.S. Pat. No. 5,656,186 is concerned with ablation and a laser-induced perforation of the cornea by means of laser pulses of the range from 150 fsec to 7 nsec. A wavelength of 770 nm is used for this purpose.
- The publication “Generation of 20-fs pulses by a prismless Cr4+:YAG laser” Ripin et alteri, Optics Letter, Vol. 27, No. 1, 1 Jan. 2002 discloses a Cr4+:YAG laser in which pulses shorter than 20 fsec were measured in the case of a prismless laser. The pulses had their maximum at 1450 nm, and in a range from 1310 nm to 1500 nm the intensity was greater than half of the maximum. By means of a logarithmic scale it was possible to observe a spectrum from 1140 nm to 1700 nm, which was the limit of the spectral instrument used.
- It is an object of the invention to create an eye treatment device that is gentle on the eye.
- The object is achieved by an eye treatment device according to
Claim 1. The light emitted by the radiation source has such a wavelength range that it brings about a reaction in a treatment region of an eye and is absorbed, at least partially, in at least one of the regions located behind same in the direction of the retina. This has the advantage that the light radiation passing through the treatment region is absorbed, and damage to the structures located behind the treatment region can be prevented. - The light emitted by the radiation source can have a wavelength range in which the treatment region is partially transmissive.
- The treatment region can be the cornea. The light radiation passing through the cornea can be absorbed, for example, in the aqueous humour. Consequently, damage to structures located behind the aqueous humour, for example the iris, the lens, the vitreous body and the retina, can be prevented.
- The reaction brought about in the treatment region by the light can be an ablation of tissue. The ablation of tissue enables the cornea to be reshaped, in order to correct any defective vision. The reaction brought about in the treatment region by the light can also be a laser-induced optical perforation of tissue, which is also referred to as photo-disruption. The laser-induced perforations, or the photo-disruptions, can be used to produce a cut in the cornea.
- The radiation source can be a laser source. A femtosecond laser source can be used to produce the laser-induced perforations.
- The wavelength range of the light emitted by the radiation source is approximately 1600 nm to approximately 1700 nm, preferably approximately 1625 nm to approximately 1675 nm, most preferably approximately 1640 nm to approximately 1660 nm. In these wavelength ranges the cornea is transmissive of light and the light passing through the cornea is absorbed in the aqueous humour, as a result of which damage to the structures located behind the aqueous humour, for example the iris, the lens, the vitreous body or the retina, can be prevented. In particular, the systems Co:MgF2 and Cr:YAG are possibilities as femtosecond laser systems for the wavelength range 1600-1700 nm.
- A method for treating the eye with light has such a wavelength range that it brings about a reaction in a treatment region and is absorbed, at least partially, in at least one of the regions located behind same in the direction of the retina. This has the advantage that the light radiation emerging from the treatment region is absorbed, and damage to the structures located behind the treatment region can be prevented.
- The treatment region can be substantially transmissive in the wavelength range. The treatment region can be the cornea. As mentioned previously, the light radiation passing through the cornea can be absorbed, for example, in the aqueous humour. Consequently, damage to structures located behind the aqueous humour, for example the iris, the lens, the vitreous body and the retina, can be prevented.
- The reaction brought about in the treatment region by the light can be an ablation of tissue. The reaction brought about in the treatment region by the light can also be a laser-induced optical perforation of tissue. The radiation source can be a laser source.
- The wavelength range in the case of the method is approximately 1600 nm to approximately 1700 nm, preferably approximately 1625 nm to approximately 1675 nm, most preferably approximately 1640 nm to approximately 1660 nm. As mentioned previously, in these wavelength ranges the cornea is transmissive of light and the light passing through the cornea is absorbed in the aqueous humour, as a result of which damage to the structures located behind the aqueous humour, for example the iris, the lens, the vitreous body and the retina, can be prevented.
- The invention is now described in greater detail with reference to the appended figures.
-
FIG. 1 shows an eye model according to Gullstrand-Le Grand, -
FIG. 2 is a diagram representing the transmission of the cornea, and -
FIG. 3 is a diagram representing the transmission of the aqueous humour. - Radiation sources suitable for ablation and incision are known to the specialist in the field of ophthalmology, in particular refractive surgery. These radiation sources include laser light sources. As mentioned at the beginning, pulse durations in the femtosecond range are used for incision, and longer pulse durations are used for ablation. So-termed frequency multipliers can be used to adapt the wavelength of the laser to the application. Such laser systems are known to the specialist in the art, and need not be described in greater detail.
-
FIG. 1 shows an eye model by Gullstrand-Le Grand. Thecornea 1 has afront surface 2 and arear surface 3. Located behind therear surface 3 of thecornea 1 is theaqueous humour 4. Located behind theaqueous humour 4 is thelens 5, having afront surface 6 and arear surface 7. Adjoining behind the lens is thevitreous body 8. Located behind thevitreous body 8 is theretina 9. The light goes into the eye through thecornea 1 and is imaged onto theretina 9. - As mentioned at the beginning, in the case of refractive surgery a laser-induced optical perforation is used to produce a cut in the
cornea 1, by means of a femtosecond laser. It is understood that the laser radiation is not fully absorbed through the laser-induced perforation in thecornea 1. In the case of eye treatment devices of the prior art, the portion of the laser radiation not absorbed in thecornea 1 passes through theaqueous humour 4, thelens 5 and thevitreous body 8, and strikes theretina 9. Depending on the wavelength used, the patient may have side-effects, for example the previously mentioned transient light syndrome or damage to theretina 9 resulting from the blue-light hazard effect. - Likewise, in the case of ablation of tissue in the
cornea 1 for the purpose of correcting defective vision, in the case of eye treatment devices of the prior art the portion of the radiation not absorbed in thecornea 1 can pass through theaqueous humour 4, thelens 5 and thevitreous body 8, and strike theretina 9. In this case, likewise, the previously described side-effects occur, depending on the wavelength used. By contrast, the radiation of the excimer laser, having a wavelength of 193 nm, is absorbed fully in the cornea. -
FIG. 2 is a diagram representing the degree of transmission of the cornea.FIG. 3 is a diagram representing the degree of transmission of the aqueous humour. InFIG. 1 , the unbroken line shows the total transmission of thecornea 1, which transmission was ascertained from six eyes. The curve denoted by 1 inFIG. 1 shows the direct transmission in the case of an eye of a child of 4½ years of age, and the curve denoted by 2 shows the direct transmission in the case of an eye of a person of 53 year of age. - In the case of both incision and ablation, the cornea is the aforementioned treatment region. A treatment is to be possible, not only on the surface of the
cornea 1, but also in deeper regions of thecornea 1. Consequently, the wavelength range selected for the treatment is to be selected in such a way that thecornea 1 is partially transmissive in this wavelength range. Suitable for this purpose, according toFIG. 2 , are, on the one hand, the wavelength range from 300 nm to 1300 nm and the wavelength range from 1600 nm to 1700 nm. - It was realized that the previously described side-effects can be prevented if the radiation not absorbed in the treatment region, i.e. the cornea, is absorbed in a region located behind same. In this case, the radiation not absorbed in the cornea cannot reach, for example, the lens and/or the
retina 9. - It is proposed, for the purpose of treating the
cornea 1, a wavelength range lies from approximately 1600 nm to. If the radiation not absorbed in thecornea 1 to use in the aqueous humour approximately 1700 nm, since in this range theaqueous humour 4 has a comparatively low transmission. Consequently, the absorption of the radiation not absorbed in thecornea 1 occurs in a region that absorbs as close as possible to thecornea 1 4, it cannot pass through the iris, thelens 5 and thevitreous body 8 and strike theretina 9, or it can do so only having been weakened by the absorption in theaqueous humour 4. As a result, damage to or impairment of other regions of the eye, and the previously described side-effects, are prevented to a large extent.
Claims (4)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07005598A EP1974703B1 (en) | 2007-03-19 | 2007-03-19 | Laser system for refractive conservative surgery for the eye |
EP07005598 | 2007-03-19 | ||
EP07005598.3 | 2007-03-19 | ||
PCT/EP2008/002233 WO2008113587A1 (en) | 2007-03-19 | 2008-03-19 | Laser system that is gentle on the eyes, for refractive surgery |
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US20100280503A1 true US20100280503A1 (en) | 2010-11-04 |
US8728061B2 US8728061B2 (en) | 2014-05-20 |
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US12/532,058 Active 2030-03-13 US8728061B2 (en) | 2007-03-19 | 2008-03-19 | Laser system that is gentle on the eyes, for refractive surgery |
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EP (1) | EP1974703B1 (en) |
JP (1) | JP5337056B2 (en) |
KR (1) | KR101312705B1 (en) |
CN (1) | CN101677874B (en) |
BR (1) | BRPI0808286B8 (en) |
CA (1) | CA2681269C (en) |
DE (1) | DE502007002675D1 (en) |
ES (1) | ES2338051T3 (en) |
MX (1) | MX2009010153A (en) |
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US10058453B2 (en) * | 2012-04-24 | 2018-08-28 | Wavelight Gmbh | Extracting lenticules for refractive correction |
RU2674381C1 (en) * | 2018-02-15 | 2018-12-07 | Федеральное государственное автономное учреждение "Межотраслевой научно-технический комплекс "Микрохирургия глаза" имени академика С.Н. Федорова" Министерства здравоохранения Российской Федерации | Method for the prevention of progression of retinal detachment |
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2008
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- 2008-03-19 JP JP2009553972A patent/JP5337056B2/en active Active
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CA2681269A1 (en) | 2008-09-25 |
KR20090125185A (en) | 2009-12-03 |
MX2009010153A (en) | 2009-10-13 |
US8728061B2 (en) | 2014-05-20 |
WO2008113587A1 (en) | 2008-09-25 |
JP5337056B2 (en) | 2013-11-06 |
EP1974703B1 (en) | 2010-01-20 |
EP1974703A1 (en) | 2008-10-01 |
CN101677874B (en) | 2012-01-25 |
ES2338051T3 (en) | 2010-05-03 |
CA2681269C (en) | 2014-09-30 |
DE502007002675D1 (en) | 2010-03-11 |
CN101677874A (en) | 2010-03-24 |
BRPI0808286A2 (en) | 2014-08-12 |
RU2009137998A (en) | 2011-04-27 |
BRPI0808286B8 (en) | 2021-06-22 |
KR101312705B1 (en) | 2013-10-01 |
RU2469689C2 (en) | 2012-12-20 |
BRPI0808286B1 (en) | 2019-07-09 |
JP2010521258A (en) | 2010-06-24 |
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